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A、B证券的相关系数为0.6，预期报酬率分别为14%和18%，标准差分别为10%和20%，在投资组合中A、B两种证券的投资比例分别为50%和50%，则A、B两种证券构成的投资组合的预期报酬率和标准差分别为（）。
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我国社会主义初级阶段的基本经济制度是( )。
The market is a concept. If you are growing tomatoes in your backyard for sale you are producing for the market. You might sell some to your neighbor and some to the manager of the local supermarket. But in either case, you are producing for the market. Your efforts are being directed by the market. If people stop buying tomatoes, you will stop producing them.If you take care of a sick person to earn money, you are producing for the market. If your father is a steel worker or a truck driver or a doctor or a grocer, he is producing goods or service for the market.When you spend your income, you are buying things from the market. You may spend money in stores, supermarkets, gas stations, and restaurants. Still you are buying from the market. When the local grocer hires you to drive the delivery truck, he is buying your labor in the labor market.The market may seem to be something abstract. But for each person or business who is making and selling something, it’s very real. If nobody buys your tomatoes, it won’t be long before you get the message. The market is telling you something. It’s telling you that you are using energies and resources in doing something the market doesn’t want you to do. You are buying from the market when you ().
Scientists have developed glass fibers as thin as human hair which are designed to carry light signals.()
In the experiments, ______.
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